1000 INDUSTRY ST 2018-01-02 MF Import

` January 28, 2005 Project No. 1'-5659 I 1Vith wall backfill placcd and compacted as recomme��ded and drainage propedy installed, we recommend I, designing unrestrained walls for an acti��e carth pressure equivalent to a (luid weighing 3� pcf. For restrained � walis, an additional uniform lateral pressure of ]00 psf should be included. Tl�ese values assume a horizontal backfill condition and that no other surcharge loading, such as traffic, sloping embankments, or adjacent ibuildings, will act on the walf. lf such conditions exist, then the imposed loading must be included in the wall design. Frictia�at the base of foundation� and passive earth pressure�vill provide resistance to these lateral loads. Values for these parameters are proviJed in Section 4.4 of this report. � 4J Drainaee I Slll fGCG' jPinal exierior grades should promote free and positive drainage away from the budding areas. Wc recommend providing a gradient of at least three percent for a minimum distance of ten feet Trom the building per'meter, I except in pa��ed locations. [n paved locations, a minimum gradicnt of t«�o percent should be provided, unless provisions are included for collection and disposal of surface water adjaccnt to the strucwre. f I Subsurfuce I In our opinion, provided positive drainage a�aay the Uuilding perimeters is provided as discussed, it would not be necessary to install perimeter foimdation drains �vhere impervious surfaces extend to the building perimeters. Perimeter foundation dr:ins should be installed where positive drainagc is not proaided, or where irrigated i landscaped areas will be installed adjacent the Uuildmgs. The foundation drain invert should be equi�•alent to thc bottom of footing elevation. The foui�dation drains should be tightlined to an approved point of controlled discharge, independent of the roof drain system. Subsurface drains must be laid with a gradient sufficient to promote positi��e flow to the point of discharge. All drains should be provided with cleanouts at easily accessible I ]ocations. These clearouts should b� scrviced at least once every year. � 4.R Utilizics � U[ilit} pipes sl�ould be bedded and backfllcd in xcordance wi[h American Public Works Association (AP1yA) I speci(ic.�[ions. As a minimum, trench backiill should be placed a�id compacted as structural fill, as described in Section 1.2 oC this repo�i. As noted, successful use of on-site soils as fill will require close moisturc control. I Wliem m�iswre cannot be controlled to facilitate proper comp�ction, trench backfill should co�sist of an imported granular snil that meets the gradation rzquirements in Section 4.2 of tliis report. I4.9 Pavemenls � Pavements should be constructed on subgrades preparect as dcscribed in Section 42 of this report. Regardless of � thc dcerec of relative compactiou achieved, the suUgrade mus[ be firm and rela[ively unyielding before pavine. Proufiolling the subgrade��ith hcavy construction equipment should be completed to verify tl�is condition. I Page No. ? � `/� �